Remotely operable vent stop

ABSTRACT

A wireless signal is propagated via a communication channel and received by a vent stop. The vent stop, upon receiving and decoding the signal, conducts an electric current to release the vent stop from a plumbing vent. In one embodiment, an intralumen audio signal is communicated to the vent stop and an adhesive joint securing the vent stop to the vent pipe is released upon passing an electric current through the joint. In one embodiment, an electric motor or solenoid releases the stop from the vent pipe. A spring or other energy storage device ejects the stop from the vent pipe following release.

RELATED APPLICATION

[0001] This application claims priority to U.S. Provisional PatentApplication Serial Number 60/422,013, filed on Oct. 29, 2002, entitledREMOTELY OPERABLE VENT CAP, which is herein incorporated by reference.

TECHNICAL FIELD

[0002] This invention relates generally to plumbing systems fordomestic, commercial and industrial waste systems and particularly, butnot by way of limitation, to systems and methods of remotely opening avent in a plumbing system.

BACKGROUND

[0003] At the time of installation, waste plumbing systems forresidential and commercial building structures are tested for leaks. Anuncorrected leak in a waste system can allow buildup of dangerous fumeswithin the structure. Testing involves filling drain traps with waterand installing a cap on the plumbing vent. Typically, the vent islocated on the roof of the building. With the system thus sealed, aregulated air pressure is applied to the waste system and variousmethods are used to identify any leaks. Following the testing procedure,the roof vent cap is removed.

[0004] To remove the vent cap, a worker typically ascends the buildingwith the aid of a ladder and physically removes the cap. The cap may bea threaded or unthreaded fitting which provides an air tight seal withthe vent pipe.

[0005] Removing the vent cap is not without hazards or inconvenience.For example, falls from atop the building roof have injured manyplumbers. In addition, the ladder can be a dangerous tool near powerlines. Furthermore, the plumber is forced to carry, or at least haveavailable, a suitable ladder.

[0006] What is needed is an improved system and method for removing avent cap.

SUMMARY

[0007] A remotely operable vent stop includes a wireless receivercoupled to a release mechanism. The wireless receiver, in oneembodiment, includes an audio frequency transducer. The releasemechanism, in one embodiment, includes an electrically disbondingadhesive joint between an upper and lower portion. A voltage appliedacross the joint will weaken and disbond the joint. A compressed springapplies a force between the two portions and ejects the upper portion,or housing from the lower portion, or coupler, when the adhesive isdisbonded. The terms coupler and coupling are used interchangeablyherein.

[0008] In one embodiment, the housing includes a vent stop. When thevent stop is secured to the coupling, and the coupling is affixed to aplumbing vent, an airtight seal is formed on the vent.

[0009] In an exemplary embodiment, the system includes a remote unit anda local unit. The remote unit is adapted for affixation to a vent pipeand includes a separable upper portion held in alignment with a plumbingsystem vent pipe by a bonded joint. The local unit is adapted fortemporary coupling with an accessible pipe fitting, also coupled to theplumbing system, and for generating a predetermined audio signal withina bore or lumen of the plumbing system. The remote unit, upon receivingthe predetermined audio signal, applies a voltage across the bondedjoint and after a predetermined current has passed, an adhesivepositioned within the joint disbonds. A spring urges the upper portionto separate from the vent pipe following disbonding of the joint. Theupper portion falls from the vent pipe, thus opening the vent to theatmosphere. The upper portion may be recovered from the roof or ground.

[0010] In one embodiment, the plumbing stop includes a plug havingexternal threads which engages internal threads of the vent pipe. In oneembodiment, the plumbing stop includes a cap having internal threadswhich engages external threads of the vent pipe.

[0011] Other aspects of the invention will be apparent on reading thefollowing detailed description of the invention and viewing the drawingsthat form a part thereof.

[0012] This summary is intended to provide a brief overview of some ofthe embodiments of the present system, and is not intended in anexclusive or exhaustive sense, and the scope of the present subjectmatter is to be determined by the attached claims and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In the drawings, like numerals describe substantially similarcomponents throughout the several views. Like numerals having differentletter suffixes represent different instances of substantially similarcomponents.

[0014]FIG. 1 illustrates a plumbing system for a residential buildingwith one embodiment of the present subject matter.

[0015]FIG. 2 includes a block diagram of one embodiment of the presentsubject matter.

[0016]FIG. 3 includes a block diagram of a processor controlledembodiment of the present subject matter.

[0017]FIG. 4 includes a cross sectional view of one embodiment of thepresent subject matter.

[0018]FIG. 5 includes a cross sectional view of portions of oneembodiment of the present subject matter having multiple ejectionsprings.

[0019]FIGS. 6A and 6B illustrate cross sectional views of one embodimenthaving a sliding spring contact and a single ejection spring.

[0020]FIG. 7 includes a flow chart of a method of manufacturing oneembodiment of the present subject matter.

[0021]FIGS. 8A and 8B illustrate cross sectional views of one embodimentof the present subject matter having a conical spring.

[0022]FIGS. 9A, 9B, 9C and 9D illustrate views of a splined couplingembodiment.

[0023]FIG. 10 includes an exploded view of a motor controlledembodiment.

[0024]FIG. 11 illustrates a sectional view of a gravity assistedembodiment.

[0025]FIG. 12 illustrates a detail view of a portion of one embodiment.

[0026]FIG. 13 includes a cross sectional view of one embodiment of thepresent subject matter having an engagement spring held in position byan electrically releasable adhesive joint.

[0027]FIG. 14 includes a piezoelectric transducer coupled to an upperhousing.

[0028]FIG. 15 includes an exploded view of a sounder and a plumbingfitting.

[0029]FIG. 16 includes a flow chart of a method of using one embodimentof the present subject matter.

DETAILED DESCRIPTION

[0030] In the following detailed description, reference is made to theaccompanying drawings which form a part hereof, and in which is shown byway of illustration specific embodiments in which the invention may bepracticed. These embodiments are described in sufficient detail toenable those skilled in the art to practice the invention, and it is tobe understood that the embodiments may be combined, or that otherembodiments may be utilized and that structural, logical and electricalchanges may be made without departing from the spirit and scope of thepresent invention. The following detailed description is, therefore, notto be taken in a limiting sense, and the scope of the present inventionis defined by the appended claims and their equivalents. In thedrawings, like numerals describe substantially similar componentsthroughout the several views. Like numerals having different lettersuffixes represent different instances of substantially similarcomponents.

[0031] The present subject matter includes methods, apparatus andsystems as described herein.

[0032]FIG. 1 illustrates how one embodiment of the present subjectmatter may be used with a drain, waste and vent (DWV) piping system. Thefigure illustrates a cut-away view of a residential house with mainsewer stack 160 and secondary sewer stack 165. Stack 160 and stack 165pass through the roof of the house and each terminates at their upperends with vent 100. In the figures, remote units 200 are affixed to eachvent 100. Following testing of the DWV plumbing system, the remote unitsare removed from the vents.

[0033] A block diagram of remote unit 200B is illustrated in FIG. 2.Communication module 205 is coupled to a release mechanism 210. In oneembodiment, communication module 205 includes an audio transduceradapted to receive a modulated audio signal propagated within a lumen ofthe plumbing system. For example, when a predetermined audio inputsignal is introduced at fitting 145, the signal is propagated throughstack 160 to vent 100 and received by remote unit 200A. Upon receivingthe audio signal, communication module 205 provides a release signal torelease mechanism 210. When release mechanism 210 is activated, a stopof remote unit 200B is ejected from the vent, thus preparing the DWVpiping system for service. The stop provides an air-tight seal with theDWV piping system and activation of the release mechanism allows thestop to be freely removable from the piping system. The stop includes adevice that occludes the bore of a pipe. In various embodiments, thestop includes a plumbing cap, plug or valve.

[0034]FIG. 3 illustrates an embodiment of remote unit 200C withprocessor 330. Supply 260 is coupled to processor 330, communicationmodule 205B and release mechanism 210B. In one embodiment, processor 330receives an electrical signal from communication module 205B, processesthe signal through one or more logic gates and provides an electricalrelease signal to release mechanism 210B provided the received signalmeets predetermined parameters. In one embodiment, processor 330includes analog circuitry for generating a release signal upon receivinga predetermined input signal. In one embodiment, processor 330 includesdigital circuitry for generating a release signal upon receiving apredetermined input signal. In one embodiment, processor 330 includes amicroprocessor.

[0035] In one embodiment, the housing is affixed to the coupling, or thevent pipe, by an electrically disbanding adhesive. The adhesive isdisposed in a thin layer between two electrically conductive surfaces. Avoltage applied between the two conductive surfaces having sufficientelectromotive force (EMF) and for a predetermined duration, causes theadhesive bond to weaken and eventually release. In one embodiment, theelectrically releasable adhesive includes an epoxy resin such asElectroRelease E4™, (EIC Laboratories of Norwood, Mass.).

[0036]FIG. 4 illustrates a view of an embodiment of remote unit 200D.Housing 250A and coupling 320A are fabricated of polyvinyl chloride(PVC) plastic. Housing 250A, in one embodiment, includes a vent stop.Coupling 320A is adapted to fit within plumbing vent pipe 100. Vent 100is coupled to a DWV plumbing system and provides venting to a fresh airsupply. Coupling 320A includes electrodes 280A which are electricallycoupled to a ground connection. In one embodiment, the ground connectionis provided by an interconnecting wire buried within coupling 320A whichconnects electrode 280A with spring 275A which is electrically connectedto supply ground. In one embodiment, the ground connection is providedby a leaf spring contact between coupling 320A and housing 250A.Coupling 320A receives a portion of housing 250A. Piezoelectrictransducer 315A is coupled to housing 250A and electrically coupled toprocessor 330. Processor 330 is coupled to ground and is powered bysupply 260. Disbonder 335 is powered by supply 260 and provides adisbonding current to adhesive 290 when processor 330 triggersdisbanding on control line 336. In one embodiment, disbonder 335 can bemodeled as a switch and a voltage multiplier, where the switch isoperated by control line 336 and the output of disbonder 335 includes anincreased supply voltage provided to adhesive 290. In one embodiment,disbonder 335 includes an electrical switch, the state of which iscontrolled by control line 336. Electrodes 280A and electrodes 285A arebonded together with electrically disbanding adhesive 290.

[0037] Springs 275A are depicted in a compressed mode and each applies aforce to urge separation of housing 250A and coupling 320A. Springs 275Aare coil springs. Seal 265A is disposed between a surface of housing250A and coupling 320A and in the embodiment shown, seal 265A includes arubber o-ring. In one embodiment, seal 265A includes a gasket. In oneembodiment, seal 265A mates with an annular sealing surface. In oneembodiment, seal 265A includes a TEFLON™ product. TEFLON™ is aregistered trademark of E. T. du Pont de Nemours and Company ofWilmington, Del. The ground connections of electrodes 280 areelectrically bonded to the ground connection of housing 250A. Seal 265A,springs 275A and electrodes 285A are affixed to housing 250A. Afterreleasing, electrodes 280A remain affixed to coupling 320A and coupling320A remains affixed to vent 100.

[0038] At the time of installation of remote unit 200D, springs 275A arecompressed between housing 250A and coupling 320A; electrodes 280A arebonded to electrodes 285; and seal 265A, and housing 250A, provide anairtight seal on coupling 320A. Coupling 320A is coupled to vent 100with an airtight joint.

[0039] To remotely separate housing 250A from coupling 320A, a modulatedaudio signal, shown at 345, is propagated through the lumen of vent 100.Modulated audio signal 345 is received by transducer 315A and anelectrical signal is supplied to processor 330. Processor 330, havingreceived an electrical signal from transducer 315A corresponding toaudio modulated with a predetermined signal, provides a control signalto disbonder 335. When disbonder 335 is energized, a voltage is appliedacross adhesive 290. Adhesive 290 is weakened upon exposure to anelectric current and when sufficiently weak, the bond fails and energystored in compressed springs 275A overcomes the joint and housing 250Ais ejected from coupling 320A. Upon ejection, seal 265A no longerprovides an air tight seal for vent 100. Housing 250A, along with seal265A, springs 275A, electrodes 285A, supply 260, disbonder 335,processor 330 and transducer 315A are ejected from coupling 320A. Wheninstalled on vent 100 and separated as herein described, coupling 320Aremains attached to vent 100 and housing 250A is ejected and may fall onthe roof of the building or tumble to the ground.

[0040]FIG. 5 illustrates a cross sectional view of portions of anembodiment of remote unit 200E where the electrically disbondingadhesive is subjected to a shear load. Housing 250B and coupling 320Bare fabricated of PVC plastic. Coupling 320B is adapted to fit around anexternal surface of plumbing vent pipe 100. Coupling 320B includeselectrodes 280A which are electrically coupled to a ground connection.In one embodiment, the ground connection is provided by aninterconnecting wire buried within coupling 320B which connectselectrode 280A with spring 275A and spring 275A is electricallyconnected to a supply ground. In one embodiment, the ground connectionis provided by a leaf spring contact between coupling 320B and housing250B.

[0041] Housing 250B receives a portion of coupling 320B. Piezoelectrictransducer 315A is coupled to housing 250B and electrically coupled toprocessor 330. Processor 330, supply 260A, supply 260B, switch 340 aredisposed within a cavity of housing 250B. Electrodes 280A and electrodes285A are bonded together with electrically disbonding adhesive 290.Springs 275A are depicted in a compressed mode and each applies a forceto urge separation of housing 250B and coupling 320B. Seal 265A isdisposed between a surface of housing 250B and coupling 320B and in theembodiment shown, seal 265A includes a rubber o-ring. The groundconnections of electrodes 280A are electrically bonded to the groundconnection of housing 250B. Seal 265A, springs 275A and electrodes 285Aare affixed to housing 250B.

[0042] At the time of installation of remote unit 200E, springs 275A arecompressed between housing 250B and coupling 320B; electrodes 280A arebonded to electrodes 285A; and seal 265A, and housing 250B, provide anairtight seal on coupling 320B. Coupling 320B is coupled to vent 100with an airtight joint.

[0043] To remotely separate housing 250B from coupling 320B, a modulatedaudio signal is propagated through the lumen of vent 325. The modulatedaudio signal is received by transducer 315A and an electrical signal issupplied to a processor. The processor, having received an electricalsignal from transducer 315A corresponding to audio modulated with apredetermined signal, provides a control signal to close a switch. Whenthe switch is closed, a voltage is applied across adhesive 290. Adhesive290 is weakened upon exposure to an electric current and whensufficiently weak, the bond fails and energy stored in compressedsprings 275A overcomes the joint and housing 250B is ejected fromcoupling 320B. Upon ejection, seal 265A no longer provides an air tightseal for vent 325. Housing 250B, along with seal 265, springs 275A,electrodes 285A, as well as the circuitry coupled to adhesive 290 andpiezoelectric transducer 315A are ejected from coupling 320B. Wheninstalled on vent 100 and separated as herein described, coupling 320Bremains attached to vent 100 and housing 250B is ejected and may fall onthe roof of the building or tumble to the ground.

[0044]FIG. 6A illustrates a cross sectional view of an embodiment of thepresent subject matter where the electrically disbonding adhesive issubjected to a shear load. In the figure, remote unit 200G includeshousing 250C and coupling 320C, both of which are fabricated of PVCplastic. Housing 250C is adapted to slidably fit within a bore ofcoupling 320C. Seal 265B is disposed at the juncture of housing 250C andcoupling 320C. Seal 265B has a T-shaped cross section in that a centerrib is disposed between housing 250C and coupling 320C and a pair offlange legs are disposed on an inner wall of each of housing 250C andcoupling 320C. In one embodiment, seal 265B is fabricated of a rubbermaterial or a low durometer plastic.

[0045] Housing 250C includes battery compartment 255 and recess 270 forreceiving spring 275B. Spring 275B is a coil spring which encircles aportion of housing 250C. Housing 250C includes a recess 270 adapted toretain spring 275B. Housing 250C also provides a mounting surface forelectrode 285B. In the embodiment shown, four such electrodes 285B areevenly distributed about the periphery of housing 250C, however, numbersgreater than or less than four are also contemplated. Each electrode285B includes conductive metal tab fabricated of aluminum sheet stock. Afirst leg of each electrode 285B is bonded to housing 250C with anadhesive. The second leg of each electrode 285B is mounted to, and iselectrically coupled with, circuit board 305. In one embodiment, circuitboard 305 includes a printed circuit board. Electrical circuitry andcomponents are mounted on circuit board 305. Piezoelectric transducer315A and transducer mounting panel 310 are affixed to circuit board 305.In one embodiment, circuit board 305 includes a processor.

[0046] Electrode 280B, in the embodiment illustrated, is of a longerlength than electrode 285B and includes an inwardly curved portion at alower end. Electrode 280B is bonded to a electrode 285B by a film ofelectrically disbonding adhesive 290. Electrode 280B is sufficientlyflexible to allow the curved portion to deflect over catch 295. Catch295 is formed on an interior wall of coupling 320C and is received in amatching hole of electrode 280B. Sliding leaf interconnect 300Aestablishes an electrical connection between an electrical conductor oncircuit board 305 and electrode 280B. Piezoelectric transducer 315A isdisposed beneath circuit board 305, and in one embodiment, is mounted onstand-off 308.

[0047]FIG. 6B illustrates selected details of the embodiment of FIG. 6A.In the figure, circuit board 305 is affixed to electrode 285B by machinescrew and nut 395. Electrode 285B is in electrical contact with a firstconductor of circuit board 305. Electrode 280B is bonded to electrode285B by electrically disbonding adhesive 290. Electrode 280B is alsoelectrically connected to circuit board 305 by interconnect 300A.Interconnect 300A includes a flexible metal conductor. Interconnect 300Ais connected to a second conductor of circuit board 305 and is affixedby machine screw and nut 405. A hole in electrode 280B engages catch 295of coupling 320C. Spring 275B urges separation of housing 250C andcoupling 320C. Catch 295 prevents separation of housing 250C andcoupling 320C provided that adhesive bond 290 remains strong. When bond290 is weakened (by application of a voltage to electrode 285Band-electrode 280B), catch 295 retains electrode 280B and electrode 285Bis carried away with the motion of housing 250C.

[0048]FIG. 7 illustrates a flow chart of method 350 for assemblingremote unit 200G. At 355, electrode 280B is bonded to electrode 285Busing an electrically disbonding epoxy resin adhesive. In assembling theembodiment of FIGS. 6A and 6B, four pairs of electrodes are prepared. At360, electrode 285B of the electrode assembly is affixed to circuitboard 305. As illustrated in FIG. 6B, electrode 285B is secured tocircuit board 305 by a machine screw and nut however, other fastenersare also contemplated, including, for example, a rivet, a self-tapingscrew, adhesive or a mechanical clip. At 365, piezoelectric transducer315A is affixed to circuit board 305. Transducer 315A, in oneembodiment, is bonded using an adhesive however, other fasteners arealso contemplated, including, for example, a clip or a mechanicalfastener. At 370, supply 260 is installed within a cavity of thehousing. In the embodiment illustrated, two batteries are used for thesupply, however numbers greater or less than two are also contemplated.At 375, circuit board 305 is affixed to housing 250C. In the embodimentillustrated, circuit board 305 is fastened to housing 250C using a heatstaked joint, however, other fasteners are also contemplated, including,for example, an ultrasonic weld, a machine or self-taping screw, arivet, a clip or adhesive. At 380, spring 275B is positioned on aportion of coupling 320C. Spring 275B is received at surface 326 andurges separation of housing 250C. At 385, seal 265B is positioned on alip of coupling 320C. Coupling 320C, seal 265B and housing 250C areadapted to allow seal 265B to remain affixed to housing 250C and readilyrelease from coupling 320C when housing 250C is separated from coupling320C. At 390, the method continues with the assembly of housing 250Conto coupling 320C.

[0049]FIGS. 8A and 8B illustrate views of remote unit 200H according toone embodiment of the present subject matter. In the figure, housing250D includes a cavity to receive four batteries 262 and circuit board305. Circuit board 305 includes circuitry for receiving an electricsignal from piezoelectric transducer 315B and generating a voltage torelease electrically disbonding adhesive 290. Electrically disbondingadhesive 290 is disposed between electrode 280C and 285C. Piezoelectrictransducer 315B is affixed to circuit board 305 by stand-offs 318.Piezoelectric transducer 315B includes a piezoelectric element encasedin a ported resonant chamber or housing. The port of the resonantchamber is positioned to expose the element to audio propagated incoupling 320D.

[0050] In one embodiment, coupling 320D includes a length of PVC pipe.In one embodiment, coupling 320D is approximately 18.5″ in length.Coupling 320D includes lower portion 321, slot 322, thin wall section323 and counterbore 324, as shown in the detail view of FIG. 8B. Lowerportion 321 is adapted for affixation to a scheduled plumbing pipesection. Spring 275C is captivated at a first end by tab 282 ofelectrode 280C and at a second end, by a surface of piezoelectrictransducer 315B. In one embodiment, spring 275 is of conical crosssection. Electrode 280C is secured to coupling 320D by engagement of tab319 with slot 322 and adhesive 284. In one embodiment, adhesive 284includes double-back tape. Thin wall section 323, having a wallthickness less than that of lower portion 321, provides clearance forinsertion of electrode 280C. Counterbore 324 provides clearance for aleg of seal 265B. An electric circuit to provide a voltage acrossadhesive 290 is provided by electrode 285C coupled to circuitry oncircuit board 305 and by the series combination of electrode 280C,spring 275C and electrical interconnect 300B coupled to circuitry oncircuit board 305. In one embodiment, interconnect 300B includes aflexible conductive wire soldered to spring 275C and soldered to circuitboard 305.

[0051] In FIGS. 8A and 8B, electrodes 280C and 285C are shown extendingupwards beyond the overall height of coupling 320D. In one embodiment,electrode 285C is adapted to extend downward into the bore of coupling320D and electrode 280C is adapted to rise above slot 322 to a heightapproximately flush with a top surface of coupling 320D. In this manner,following separation of housing 250D, electrodes 280C remainsubstantially within the bore of coupling 320D following separation.

[0052] According to one embodiment, assembly of remote unit 200Hincludes inserting circuit board 305 and batteries 262 into housing250D. Electrode 285C is captivated within housing 250D by an adhesivejoint or mechanical fastener within the cavity of housing 250D. Inaddition, electrodes 285C and electrodes 280C are bonded together usingelectrically releasable adhesive 290. A small diameter end of spring275C is positioned against a surface of piezoelectric transducer 315Band a large diameter end of spring 275C is captivated by tabs 282. Next,an adhesive is applied to an exterior surface of electrode 280C andhousing 250D is mated with coupling 320D by inserting electrodes 280Cinto the bore of coupling 320D and engaging tab 319 with slot 322.

[0053] According to one application, coupling 320D of remote unit 200His assembled onto vent pipe 100 using a standard or scheduled pipecoupling positioned below a roof line. Coupling 320D is thus positionedto extend through the roof and allow unobstructed installation of a roofvent flashing.

[0054] For one particular type of glue, the current flow required tosufficiently weaken the joint is a function of the thickness of the glueline. Consequently, a uniformly dimensioned glue line will havepredictable and repeatable release characteristics. In one embodiment ofthe present subject matter, the distance between the electrodesdetermines the dimensional thickness of the glue line. In oneembodiment, the electrodes are fabricated of sheet stock and the spacingbetween the electrodes is determined by molded features in therespective portions of the present subject matter. For example, in oneembodiment, a first electrode is held captive by alignment features thatengage the edges of the electrode. An amount of glue is deposited on thefirst electrode surface and a second electrode is brought into contactwith the glue and held apart from the first electrode by molded spacers.In one embodiment, the first and second electrode are positioned with apredetermined spacing and a glue is injected in the void between theelectrodes. In one embodiment, the spacing of the electrodes isestablished by means of molded bosses or shoulders formed in theelectrode mounting area. In one embodiment, a shim or spacer is insertedbetween the electrodes and compressed to achieve a desired parallelspacing.

[0055]FIGS. 9A, 9B, 9C and 9D illustrate different views of anembodiment for establishing a uniform glue line using a splinedassembly. FIG. 9A illustrates housing 250E and an electrode 285Ddisposed atop each of three land areas. Three valleys 420 are showninterspersed between the lands. FIG. 9B illustrates coupling 320E and anelectrode 280D disposed at the bottom of each of three valleys. Threeland areas 425 are shown interspersed between the valleys. FIG. 9Cincludes a perspective view of coupling 320E aligned for insertion intohousing 250E. In FIG. 9C, electrodes 285D and electrodes 280D arevisible. FIG. 9D illustrates a sectional view through housing 250E andcoupling 320E. Bond 290 is disposed between electrode 280D and electrode285D.

[0056] In one embodiment, the release mechanism of the remote unitincludes a motor. A motor, as used herein, includes any device thatphysically displaces an armature in response to an electric current. Inone embodiment, displacement of an armature of a solenoid triggersseparation of the housing and the coupling. In one embodiment, anelectromagnet is operated to trigger separation of the housing andcoupling.

[0057]FIG. 10 illustrates an exploded view of remote unit 200J accordingto one embodiment of the present subject matter. In the figure, housing250F is adapted to receive seal 265B, spring 275B, supply 260 andrelease mechanism 410. Release mechanism 410 includes a motor drivengear train for displacing dogs 415 relative to corresponding L-shapedslots 420 of coupling 320F. Release mechanism 410 includes electroniccircuitry and components for receiving a wireless signal. Upon receivingthe wireless signal, dogs 415 are rotated about axis 90 in slots 420.When dogs 415 have moved sufficiently far, spring 275B urges separationof housing 250F from coupling 320F, thus breaking the airtight sealprovided by seal 265B.

[0058]FIG. 11 illustrates a cross sectional view of remote unit 200Kaccording to one embodiment. In the figure, housing 250G includes acavity for batteries and electronic circuitry, here modeled as switch455. Switch 455 includes circuitry for receiving a predetermined releasesignal and applying a voltage to adhesive joint 290 in response toreceiving the signal. Housing 250G includes an angled base which matchesan angle on coupling 320G. In the embodiment shown in the figure,electrode 485 encircles at least a portion of a diameter of housing 250Gand electrode 480 encircles at least a portion of a diameter of coupling320G. In one embodiment, two or more electrode segments are distributedabout a diameter of both housing 250G and coupling 320G. An electricalconnection is established between supply 260 and electrode 480 by meansof interconnect 465 and interconnect 475. Interconnect 465 is affixed tohousing 250G by anchor 460. Anchor 460 includes a heat staked platehowever, other means of fastening are also contemplated, including forexample, ultrasonic welding, rivet, screw or adhesive. Interconnect 465,when assembled, establishes an electrical connection with contact 470.Contact 470 is electrically coupled to electrode 480 by interconnect475.

[0059]FIG. 12 illustrates an exploded detail view of a portion ofhousing 250H and coupling 320H. In the figure, housing 250H includesconductive electrode 485. Electrode 485 is aligned with adhesive 290disposed in cavity 292. Cavity 292 is sized to receive a film ofelectrically releasable adhesive and electrode 480 disposed at a bottomof cavity 292. Seal 265A is received by cavity 266 and cavity 264.

[0060] Electrically releasable adhesive 290 bonds housing 250H tocoupling 320H. Seal 265A provides an air-tight seal to allow testing ofthe vent system. When switch 455 of FIG. 11 is closed, electric currentflows through interconnect 465, contact 470 and interconnect 475 andprovides a current through adhesive 290 by electrode 480 and electrode485. A voltage induced across adhesive 290 causes the adhesive toweaken. When sufficiently weak, gravitational forces urges housing 250Gto slide away from alignment with coupling 320G and fall away from vent100. In one embodiment, a spring is positioned within remote unit 200Kto urge separation of housing 250G and coupling 320G. In the embodimentsof FIGS. 11 and 12, the adhesive joint is undergoing a tension forcewhen a positive air pressure is applied to the vent system.

[0061] In one embodiment, an electrically releasable adhesive isdisposed to directly hold the vent stop in a fixed position relative tothe coupling and a seal positioned between the vent stop and couplingprovides an airtight joint. In one embodiment, the electricallyreleasable adhesive is disposed to hold two or more structural elementsin a fixed position relative to each other and when the adhesive isdisbonded, a release mechanism is operated to allow the vent stop to befreely separated from the coupling.

[0062]FIG. 13 illustrates an embodiment wherein an adhesively bondedjoint is used to hold spring-loaded clips in position, thus securing thevent stop relative to the coupling. In the figure, electrode 710 andelectrode 715 are fabricated of conductive metal strips and bondedtogether with electrically releasable adhesive 290 in the manner of alap joint. Each end of extension spring 705 is coupled to a holding clip720 by link 725. The bonded electrode assembly of electrode 710 andelectrode 715 is under a compression load applied by stretched extensionspring 705. Extension spring 705 urges holding clips 720 in a directiontowards the interior of coupling 320K. In one embodiment, extensionspring 705 is fabricated of non-conductive material. In one embodiment,extension spring 705 is fabricated of a metal and includes an insulatorportion to prevent shorting out electrode 710 and electrode 715. Holdingclips 720 are affixed to housing 250K at an upper end and a tab formedat the lower end of holding clips 720 engages slot 322 on the interiorwall surface of coupling 320K. An airtight seal is provided by seal265A. Release springs 275C are affixed to housing 250K at a first endand contact a surface of coupling 320K at a second end. Release springs275C are under tensional forces which urges separation of housing 250Kand coupling 320K.

[0063] Electrical circuitry not shown in the figure is adapted toprovide an electrical current to electrode 715 and electrode 710 uponreceipt of a release signal. The electrical current weakens the adhesivebond causing electrode 715 and electrode 710 to slide past each otherunder the compressive force from spring 705. The contraction of spring705 draws holding clips 720 from slot 322 and the extension forces fromrelease springs 275C urges separation of housing 250K from coupling320K.

[0064] Other embodiments are also contemplated wherein a weakeneddisbonding adhesive provides a trigger for the separation of a housingand coupling.

[0065] In one embodiment, the housing is separated from the couplingupon receipt of a wireless signal. The wireless signal, according to oneembodiment, includes an audio frequency signal propagated through theplumbing system. FIG. 14 illustrates piezoelectric transducer 31 5Aaffixed to circuit board 305 by riser 490. Riser 490 includes an annularmounting surface for affixing piezoelectric transducer 315A to circuitboard 305. Riser 490, in one embodiment, is fabricated of moldedplastic. Piezoelectric transducer 315A is positioned a distance ofapproximately ¼ wavelength away from circuit board 305 and an electricalsignal is conducted using wires 495.

[0066]FIG. 15 illustrates local unit 600 for generating audio fortriggering separation of the remote unit. In the figure, plug 605includes external threads for engagement with internal threads ofplumbing fitting 145. Plumbing fitting 145, in one embodiment, includesa clean out fitting and is installed in a convenient location within theplumbing system, as shown in FIG. 1. Piezoelectric transducer 610 ispositioned within a cavity of plug 605 and displaced from the backwallof plug 605 by riser 615. Piezoelectric transducer 610 is coupled tosignal generator 620. Signal generator 620 supplies an audio frequencysignal which produces an audio signal within the plumbing system. In oneembodiment, the generated audio signal has a carrier frequency ofapproximately3 kilo Hertz (kHz) and a modulation frequency ofapproximately 3 Hertz (Hz). In one embodiment, the generated audiosignal has a carrier frequency greater or less than approximately 3kHzand a modulation frequency of greater or less than 3Hz. In oneembodiment, plug 605 includes a portable power supply, such as, forexample, a battery. In one embodiment, plug 605 includes a user operableswitch for activating piezoelectric transducer 610.

[0067] In one embodiment, the audio signal is fully modulated at 100%and thus oscillates between a zero, or quiescent, level and a peaksignal level. In one embodiment, the audio signal is modulated at a rateless than 100%.

[0068] In one embodiment, plug 605 includes a power cord for couplingwith a metered electric service. In one embodiment, the signal producedby signal generator 620 can be tailored to operate a particular remoteunit selected from a plurality of remote units. In one embodiment, plug605 can be installed in any fitting 145 shown in FIG. 1 and an audiosignal will cause release of all remote units 200A. In one embodiment,plug 605 can be installed in any fitting 145 shown in FIG. 1 and anaudio signal will cause release of a predetermined remote unit 200A.

[0069] In one embodiment, the local unit is coupled to an exterior wallof a vent and an audio signal is propagated through the wall of the ventand into the interior or lumen of the vent.

[0070] According to one embodiment, following testing of the DWV systemusing the present subject matter, local unit 600 is removed from fitting145 and a standard plumbing plug is installed.

[0071] Other embodiments of local unit 600 are also contemplated. Forexample, in one embodiment, a piezoelectric transducer is affixed to anunthreaded fitting. In one embodiment, the transducer is affixed to theplumbing system by a slip joint. In one embodiment, the transducer isaffixed to a fitting adapted for a manual press-fit against a fixture orfitting of a plumbing system. For example, in one embodiment, thetransducer is manually held in position at a plumbing fitting, a wasteline p-trap or a toilet bowl.

[0072]FIG. 16 illustrates a flow chart of method 625 for using thepresent subject matter. At 630, the remote unit is armed for separation.In one embodiment, this entails manually operating an electrical switchon the remote unit to supply power to circuitry for monitoring thesignal from the piezoelectric transducer of the remote unit. In oneembodiment, the remote unit includes a manual switch coupled to alanyard and when the switch is actuated, an indicator light isilluminated to indicate that the unit is armed. At 635, the remote unitis installed on the plumbing vent. In one embodiment, this includesproviding a coupling to the vent at a position below the roof line ofthe structure. With the remote unit in position and armed forseparation, the plumbing system can be tested for leaks, as indicated at640. Leak testing may involve closing any rough-in openings and fillingdrains and p-traps with water. Following satisfactory testing, at 645,the remote unit is separated. In one embodiment, this entails removing astandard plumbing plug from a clean out fitting and installing plug 600.Plug 600, in one embodiment, includes a portable power supply, a signalgenerator and a manually operable switch. When a suitable audio signalis generated within the plumbing system, the housing separates from thecoupling of the remote unit. In the event that multiple remote units areinstalled, each remote unit separates independent of any other remoteunit. At 650, the separated housing is recovered. In one embodiment, thecoupling and an electrode remain on the vent. In one embodiment, theseparated housing can be fitted to a different coupling for another use.In one embodiment, the housing includes a generally spherical cover thatfacilitates recovery of the housing.

[0073] In one embodiment, the release mechanism is armed prior toinstalling the remote unit on the plumbing vent. The remote unitproduces an audible beep tone when armed.

Alternative Embodiments

[0074] Variations of the above embodiments are also contemplated. Forexample, in one embodiment, the remote unit includes an infrared (IR)communication port and is adapted to receive an IR signal. Uponreceiving an IR signal modulated with a predetermined signal, the remoteunit provides a release signal to trigger the separation of the housingfrom the coupling. In one embodiment, the local unit includes a handheldtransmitter which has an IR port. The IR port of the local unit is aimedin the general direction of the remote unit and a suitable signal istransmitted.

[0075] In one embodiment, the remote unit includes an optical portadapted to receive an optically communicated signal from, for example, alaser light source.

[0076] In one embodiment, the housing includes a signal generator andupon receipt of a signal to separate the housing and coupling, theremote unit generates and sounds an audible signal to acknowledgereceipt of the release signal. Other distinctive sounds can be generatedfor other purposes. For example, upon arming, one embodiment renders anaudible signal to confirm the mode of operation of the remote unit. Inone embodiment, piezoelectric transducer 315 produces audio in responseto a signal received from a signal generator coupled to housing 250.

[0077] In one embodiment, a wireless signal is communicated to theremote unit to trigger separation of the housing from the coupling.Other messages are also contemplated. In one embodiment, a wirelesssignal is communicated to the remote unit to disarm the remote unit. Inone embodiment, current drawn from the remote unit power supply in thedisarmed mode is lower than that drawn when armed.

[0078] In one embodiment, the remote unit includes a wirelesstransmitter. In one embodiment, the wireless transmitter of the remoteunit sends a signal in response to an inquiry signal received by theremote unit. In one embodiment, the wireless transmitter of the remoteunit sends a signal according to a predetermined schedule. The wirelesssignal from the remote unit, according to one embodiment, includes theoperational mode of the remote unit. In one embodiment, the wirelesssignal includes data corresponding to a condition or state of charge ofthe battery of the remote unit. In one embodiment, a message from theremote unit indicates that a release signal has been received but thatan error condition exists which precludes separation of the housing. Inone embodiment, the wireless message includes an error code.

[0079] In one embodiment, the local unit includes a visual displaypanel. The display panel indicates data corresponding to a messagereceived from the remote unit.

[0080] In one embodiment, the wireless signal includes an audiofrequency signal. In one embodiment, the remote unit includes microphonefor receipt of an audio frequency signal. In one embodiment, the remoteunit includes an audio speaker. In one embodiment, the microphone issensitive to audio propagated external to the lumen of the vent.

[0081] In one embodiment, the communication module includes a radiofrequency (RF) receiver. In one embodiment, the communication moduleincludes a radio frequency (RF) transmitter.

[0082] In one embodiment, the remote unit includes a portable powersupply and a manually operable switch coupled to the release mechanism.Activation of the manually operable switch triggers separation of thehousing from the coupling. In one embodiment, the manually operableswitch includes a lanyard. The lanyard is routed from the remote unit toa convenient location such as, for example, a nearby window or theground. Upon activating the switch by pulling on the lanyard, thehousing separates from the coupling.

[0083] In one embodiment, the remote unit includes a release mechanismand a pair of wires having a first end connected to the releasemechanism. The second end of the pair of wires is routed from the remoteunit to a convenient location such as, for example, a nearby window orthe ground. To release the housing, a power supply is coupled to thepair of wires.

[0084] In one embodiment, the remote unit includes a portable powersupply. In one embodiment, the portable power supply includes one ormore batteries. In one embodiment, the portable power supply includes asolar power panel.

[0085] In one embodiment, the release mechanism includes an electricmotor operated gear train. For example, in one embodiment, the releasemechanism includes one or more retaining pins that engage a matingsurface and when the retaining pins are retracted, the housing isreleased from the coupling. In one embodiment, the motor includes anelectric solenoid.

[0086] In one embodiment, the disbonding adhesive includes a thermallyreleasable adhesive. Application of heat causes the thermally releasableadhesive to soften and release. In one embodiment, an electrical heateris actuated upon receipt of a signal from the communication module. Inone embodiment, a chemical heater is actuated upon receipt of a signalfrom the communication module.

[0087] In one embodiment, the disbonding adhesive includes an opticallyreleasable adhesive. Exposure of the adhesive to a light having aparticular characteristic, (i.e., a particular wavelength) causes theoptically releasable adhesive to soften and release. In one embodiment,a light emitting diode (LED) is coupled to the housing and isilluminated upon receipt of a signal from the communication module. Inone embodiment, an LED coupled to the housing indicates that the remoteunit is armed.

[0088] In one embodiment, the disbanding adhesive is affixed to one ormore electrodes. In one embodiment, multiple adhesive joints aredistributed about a diameter of the remote unit. For example, in oneembodiment, two sets of electrodes (each with a film of disbondingadhesive) are distributed about the remote unit. More or less than twosets of electrodes are also contemplated. With multiple sets ofelectrodes, one embodiment provides that the sets of electrodes areuniformly distributed about a diameter of the remote unit.

[0089] In one embodiment, a single spring is provided to urge separationof the housing from the coupling. In one embodiment, multiple springs,uniformly spaced, are provided to urge separation of the housing fromthe coupling.

[0090] In one embodiment, the spacing between the piezoelectric elementof the remote unit and a circuit board is greater or less than ¼wavelength.

[0091] In one embodiment, the housing, power supply, seal and spring isejected from the vent upon release. In one embodiment, one or moreelectrodes are ejected with the housing.

[0092] In one embodiment, the remote unit includes a manually operableelectric switch. Actuation of the electric switch engages the circuitryto monitor signals received from the communication module. In oneembodiment, the manually operable electric switch is connected to alanyard. In one embodiment, the manually operable electric switchincludes an insulative tab that separates a pair of contacts. In oneembodiment, a light is coupled to the arm switch to indicate that theremote unit is in the armed mode.

[0093] In one embodiment, the release mechanism includes an actuator torelease the housing from the coupling. In one embodiment, the actuatorincludes a disbonding adhesive. In one embodiment, the actuator includesa motor. In one embodiment, the actuator includes a solenoid.

[0094] In one embodiment, a wireless signal is communicated acousticallywithin the plumbing system. In one embodiment, the remote unit includesan actuator coupled to a wireless signal receiver. The actuator iscoupled to an operable mechanical device or plumbing valve. Uponreceiving the wireless signal, the mechanical device or a plumbing valveis manipulated by the actuator.

[0095] In one embodiment, the ejected housing is recovered and discardedwhile the coupling remains on the vent. In one embodiment, the ejectedhousing is serviced and remanufactured using another coupling. In oneembodiment, remanufacturing includes replacing the batteries, replacingthe seal and testing the functionality of the communication module andrelease mechanism.

[0096] In one embodiment, the release mechanism of the remote unitincludes an energy storage device to urge separation of the housing fromthe coupling. In one embodiment, the energy storage device includes aspring. In one embodiment, the energy storage device includes a chemicalcompound that when catalyzed, a reaction occurs thus releasing energy.In one embodiment, the energy storage device includes a motor. In oneembodiment, a positive atmospheric pressure is applied to the vent tourge separation of the housing and coupling.

[0097] In one embodiment, an electrode includes aluminum. In oneembodiment, an electrode includes copper. In one embodiment, anelectrode includes stainless steel. In one embodiment, an electrodeincludes an electrically conductive material.

[0098] In one embodiment, the housing includesacrylonitrile-butadiene-styrene (ABS) plastic. In one embodiment, thehousing includes PVC plastic. In one embodiment, the housing includes apolymer material. In one embodiment, the coupling includes ABS plastic.In one embodiment, the coupling includes PVC plastic. In one embodiment,the coupling includes a polymer material. In one embodiment, thecoupling is adapted for bonding with ABS or PVC plumbing pipe.

[0099] In one embodiment, the number of springs differs from that of thenumber of sets of electrodes.

[0100] In one embodiment, an electrode is fastened to the housing usinga mechanical fastener. In one embodiment, an electrode is fastened tothe housing using a threaded fastener. In one embodiment, an electrodeis fastened to the housing using a clip. In one embodiment, an electrodeis fastened to the housing using a heat staked joint. In one embodiment,an electrode is fastened to the housing using an ultrasonically weldedjoint.

[0101] In one embodiment, the housing includes a substantially sphericalstructure adapted to facilitate recovery of the housing from a roof. Inone embodiment, the spherical structure includes a soft foam structurewith a cavity adapted to receive a housing. In one embodiment, thespherical structure is sized to reduce the likelihood of entrapment in agutter or downspout.

[0102] In one embodiment, the housing includes a first portable supplycoupled to supply a voltage to the processor or circuitry of the presentsubject matter. In one embodiment, the housing includes a secondportable supply coupled to supply a voltage to the disbonding adhesiveof the present subject matter. In one embodiment, the housing includesan inductor and circuitry configured to supply a second voltage to thedisbanding adhesive wherein the second voltage is greater than the firstportable supply.

[0103] In one embodiment, the housing includes a capacitor and circuitryconfigured to supply a second voltage to the disbanding adhesive whereinthe second voltage is greater than the first portable supply.

[0104] In one embodiment, an electrode is bonded to a circuit board by ascrew. In one embodiment, an electrode is bonded to a circuit board by apress fit connection.

[0105] In one embodiment, the processor includes one or more logic gatesand circuitry adapted to generate a release signal in response toreceiving a predetermined wireless signal. In one embodiment, theprocessor includes a microprocessor.

[0106] In one embodiment, a disbanding adhesive provides both theholding force to prevent decoupling of the stop and also provides anair-tight seal for the plumbing system. In one embodiment, an air-tightseal is provided by an o-ring or gasket and the disbonding adhesiveholds the stop to the coupling.

[0107] As used herein, the term pipe includes plumbing pipes or tubessuch as metal or plastic pipes use in DWV systems or supply lines. Theterm pipe also refers to gas piping. The term pipe also includesductwork such as that made of sheet metal and typically used forheating, ventilating and air conditioning (HVAC) applications.

Conclusion

[0108] The above description is intended to be illustrative, and notrestrictive. Many other embodiments will be apparent to those of skillin the art upon reviewing the above description.

What is claimed is:
 1. A system comprising: a plumbing vent stop; and abonded joint including an electrically releasable adhesive and whereinthe vent stop is released upon release of the adhesive.
 2. The system ofclaim 1 further including an electric current producing means coupled tothe joint.
 3. The system of claim 2 further including a wirelesstransducer coupled to the current producing means and wherein a currentis passed through the joint upon receipt of a signal received by thetransducer.
 4. The system of claim 1 further including a coupler adaptedfor affixation to a plumbing vent and wherein the coupler and the ventstop are held in alignment by the joint.
 5. The system of claim Ifurther including an energy storage device coupled to the vent stop andadapted for urging displacement of the vent stop upon release of theadhesive.
 6. The system of claim 1 wherein the vent stop includes aplumbing plug.
 7. The system of claim 1 wherein the vent stop includes aplumbing cap.
 8. A system comprising: a plumbing vent stop; a vent stopreleasing means coupled to the vent stop and adapted to selectively opena plumbing vent; and signal receiver means adapted to actuate the ventstop releasing means upon receipt of a predetermined signal.
 9. Thesystem of claim 8 wherein the vent stop releasing means includes anelectrically releasable adhesive.
 10. The system of claim 8 wherein thevent stop releasing means includes a motor.
 11. The system of claim 8wherein the signal receiver means includes a wireless receiver.
 12. Thesystem of claim 8 wherein the signal receiver means includes an audiotransducer.
 13. The system of claim 12 wherein the audio transducer isresponsive to audio propagated within the plumbing vent.
 14. A methodcomprising: coupling an audio transducer to a pipe; driving thetransducer with a modulated audio frequency signal; and operating anactuator coupled to the pipe in response to receiving the modulatedaudio frequency signal at the actuator.
 15. The method of claim 14wherein coupling the audio transducer to the pipe includes affixing atransducer to a fitting.
 16. The method of claim 14 wherein driving thetransducer with the modulated audio frequency signal includespropagating a signal with a carrier frequency of approximately 3 kiloHertz (kHz).
 17. The method of claim 14 wherein driving the transducerwith the modulated audio frequency signal includes propagating a signalwith a modulation frequency of approximately 3 Hertz (Hz).
 18. Themethod of claim 14 wherein driving the transducer with the modulatedaudio frequency signal includes driving the transducer with a fullymodulated signal.
 19. The method of claim 14 wherein operating theactuator includes opening a vent.
 20. The method of claim 14 furtherincluding generating an electrical control signal after receiving themodulated audio frequency signal.
 21. An apparatus comprising: anannular sealing surface; an actuator coupled to the annular sealingsurface and adapted to selectively disengage the annular sealing surfacefrom a mating surface; a wireless receiver coupled to the actuator; anda spring coupled to the annular sealing surface and adapted to urgedisengagement of the annular sealing surface from the mating surface;and wherein the wireless receiver is adapted to provide a signal forcontrolling the actuator.
 22. The apparatus of claim 21 wherein themating surface further includes a plumbing coupler adapted foraffixation to a plumbing vent.
 23. The apparatus of claim 21 wherein theactuator includes an adhesive.
 24. The apparatus of claim 23 wherein theadhesive includes an electrically disbanding adhesive.
 25. The apparatusof claim 21 wherein the wireless receiver includes an audio frequencysignal receiver.
 26. A device comprising: a plumbing stop; a couplingadapted to mate with the plumbing stop; an adhesive joint havingadhesive disposed therein and wherein an airtight seal is formed betweenthe plumbing stop and the coupling when the adhesive is cured.
 27. Thedevice of claim 26 wherein the plumbing stop and coupling are freelyseparable when the adhesive is weakened.
 28. The device of claim 26further including a first electrode and a second electrode coupled tothe adhesive joint and wherein the adhesive is weakened when an electriccurrent is conducted through the adhesive joint.
 29. The device of claim26 further including a linkage coupled to the plumbing stop and thecoupling and wherein the adhesive joint secures the linkage in a firstposition when the adhesive is cured and in a second position when theadhesive is weakened.